Flow boiling heat transfer characteristics of a minichannel up to dryout condition / Rashid Ali in Journal of heat transfer, Vol. 133 N° 8 (Août 2011)  

Public ISBD [article]  inJournal of heat transfer > Vol. 133 N° 8 (Août 2011) . - pp. [081501/1-10] Titre : Flow boiling heat transfer characteristics of a minichannel up to dryout condition Type de document : texte imprimé Auteurs : Rashid Ali, Auteur ; Björn Palm, Auteur ; Mohammad H. Maqbool, Auteur Année de publication : 2011 Article en page(s) : pp. [081501/1-10] Note générale : Physique Langues : Anglais (eng) Mots-clés : Microchannels Two-phase Boiling Heat transfer Dryout Index. décimale : 536 Chaleur. Thermodynamique Résumé : In this paper, the experimental flow boiling heat transfer results of a minichannel are presented. A series of experiments was conducted to measure the heat transfer coefficients in a minichannel made of stainless steel (AISI 316) having an internal diameter of 1.70 mm and a uniformly heated length of 220 mm. R134a was used as a working fluid, and experiments were performed at two different system pressures corresponding to saturation temperatures of 27°C and 32°C. Mass flux was varied from 50 kg/m2 s to 600 kg/m2 s, and heat flux ranged from 2 kW/m2 to 156 kW/m2. The test section was heated directly using a dc power supply. The direct heating of the channel ensured uniform heating, which was continued until dryout was reached. The experimental results show that the heat transfer coefficient increases with imposed wall heat flux, while mass flux and vapor quality have no considerable effect. Increasing the system pressure slightly enhances the heat transfer coefficient. The heat transfer coefficient is reduced as dryout is reached. It is observed that the dryout phenomenon is accompanied with fluctuations and a larger standard deviation in outer wall temperatures. DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JHTRAO00013300 [...] [article] Flow boiling heat transfer characteristics of a minichannel up to dryout condition [texte imprimé] / Rashid Ali, Auteur ; Björn Palm, Auteur ; Mohammad H. Maqbool, Auteur . - 2011 . - pp. [081501/1-10]. Physique Langues : Anglais (eng) in Journal of heat transfer > Vol. 133 N° 8 (Août 2011) . - pp. [081501/1-10] Mots-clés : Microchannels Two-phase Boiling Heat transfer Dryout Index. décimale : 536 Chaleur. Thermodynamique Résumé : In this paper, the experimental flow boiling heat transfer results of a minichannel are presented. A series of experiments was conducted to measure the heat transfer coefficients in a minichannel made of stainless steel (AISI 316) having an internal diameter of 1.70 mm and a uniformly heated length of 220 mm. R134a was used as a working fluid, and experiments were performed at two different system pressures corresponding to saturation temperatures of 27°C and 32°C. Mass flux was varied from 50 kg/m2 s to 600 kg/m2 s, and heat flux ranged from 2 kW/m2 to 156 kW/m2. The test section was heated directly using a dc power supply. The direct heating of the channel ensured uniform heating, which was continued until dryout was reached. The experimental results show that the heat transfer coefficient increases with imposed wall heat flux, while mass flux and vapor quality have no considerable effect. Increasing the system pressure slightly enhances the heat transfer coefficient. The heat transfer coefficient is reduced as dryout is reached. It is observed that the dryout phenomenon is accompanied with fluctuations and a larger standard deviation in outer wall temperatures. DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JHTRAO00013300 [...]

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